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The effect of different parameters on the development of compressive strength of oil palm shell geopolymer concrete.

Kupaei RH, Alengaram UJ, Jumaat MZ - ScientificWorldJournal (2014)

Bottom Line: The pretreatment with alkaline solution did not have a significant positive effect on the water absorption of OPS aggregate and the compressive strength of OPSGPC.The result revealed that a maximum compressive strength of 32 MPa could be obtained at a temperature of 65°C and curing period of 4 days.This investigation also found that an A/FA ratio of 0.45 has the optimum amount of alkaline liquid and it resulted in the highest level of compressive strength.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
This paper presents the experimental results of an on-going research project on geopolymer lightweight concrete using two locally available waste materials--low calcium fly ash (FA) and oil palm shell (OPS)--as the binder and lightweight coarse aggregate, respectively. OPS was pretreated with three different alkaline solutions of sodium hydroxide (NaOH), potassium hydroxide, and sodium silicate as well as polyvinyl alcohol (PVA) for 30 days; afterwards, oil palm shell geopolymer lightweight concrete (OPSGPC) was cast by using both pretreated and untreated OPSs. The effect of these solutions on the water absorption of OPS, and the development of compressive strength in different curing conditions of OPSGPC produced by pretreated OPS were investigated; subsequently the influence of NaOH concentration, alkaline solution to FA ratio (A/FA), and different curing regimes on the compressive strength and density of OPSGPC produced by untreated OPS was inspected. The 24-hour water absorption value for OPS pretreated with 20% and 50% PVA solution was about 4% compared to 23% for untreated OPS. OPSGPC produced from OPS treated with 50% PVA solution produced the highest compressive strength of about 30 MPa in ambient cured condition. The pretreatment with alkaline solution did not have a significant positive effect on the water absorption of OPS aggregate and the compressive strength of OPSGPC. The result revealed that a maximum compressive strength of 32 MPa could be obtained at a temperature of 65°C and curing period of 4 days. This investigation also found that an A/FA ratio of 0.45 has the optimum amount of alkaline liquid and it resulted in the highest level of compressive strength.

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FESEM of ambient-cured OPSGPC incorporating pretreated OPS with KOH.
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Related In: Results  -  Collection


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fig10: FESEM of ambient-cured OPSGPC incorporating pretreated OPS with KOH.

Mentions: Figure 10 shows the FESEM analysis image of oven-cured OPSGPC including pretreated OPS in KOH. More condensed geopolymer paste with fewer pores is obvious in this figure which leads to higher compressive strength than the ambient-cured OPSGPCs. This might be attributed to the better geopolymerization process due to oven curing condition. It should be noted that the other specimens pretreated with alkaline and PVA solutions produced comparable strength. It means that pretreatment with alkaline solution in oven-cured condition leads to higher compressive strength in OPSGPC and pretreatment with PVA solution in ambient-cured condition causes higher compressive strength in OPSGPC.


The effect of different parameters on the development of compressive strength of oil palm shell geopolymer concrete.

Kupaei RH, Alengaram UJ, Jumaat MZ - ScientificWorldJournal (2014)

FESEM of ambient-cured OPSGPC incorporating pretreated OPS with KOH.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4228731&req=5

fig10: FESEM of ambient-cured OPSGPC incorporating pretreated OPS with KOH.
Mentions: Figure 10 shows the FESEM analysis image of oven-cured OPSGPC including pretreated OPS in KOH. More condensed geopolymer paste with fewer pores is obvious in this figure which leads to higher compressive strength than the ambient-cured OPSGPCs. This might be attributed to the better geopolymerization process due to oven curing condition. It should be noted that the other specimens pretreated with alkaline and PVA solutions produced comparable strength. It means that pretreatment with alkaline solution in oven-cured condition leads to higher compressive strength in OPSGPC and pretreatment with PVA solution in ambient-cured condition causes higher compressive strength in OPSGPC.

Bottom Line: The pretreatment with alkaline solution did not have a significant positive effect on the water absorption of OPS aggregate and the compressive strength of OPSGPC.The result revealed that a maximum compressive strength of 32 MPa could be obtained at a temperature of 65°C and curing period of 4 days.This investigation also found that an A/FA ratio of 0.45 has the optimum amount of alkaline liquid and it resulted in the highest level of compressive strength.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
This paper presents the experimental results of an on-going research project on geopolymer lightweight concrete using two locally available waste materials--low calcium fly ash (FA) and oil palm shell (OPS)--as the binder and lightweight coarse aggregate, respectively. OPS was pretreated with three different alkaline solutions of sodium hydroxide (NaOH), potassium hydroxide, and sodium silicate as well as polyvinyl alcohol (PVA) for 30 days; afterwards, oil palm shell geopolymer lightweight concrete (OPSGPC) was cast by using both pretreated and untreated OPSs. The effect of these solutions on the water absorption of OPS, and the development of compressive strength in different curing conditions of OPSGPC produced by pretreated OPS were investigated; subsequently the influence of NaOH concentration, alkaline solution to FA ratio (A/FA), and different curing regimes on the compressive strength and density of OPSGPC produced by untreated OPS was inspected. The 24-hour water absorption value for OPS pretreated with 20% and 50% PVA solution was about 4% compared to 23% for untreated OPS. OPSGPC produced from OPS treated with 50% PVA solution produced the highest compressive strength of about 30 MPa in ambient cured condition. The pretreatment with alkaline solution did not have a significant positive effect on the water absorption of OPS aggregate and the compressive strength of OPSGPC. The result revealed that a maximum compressive strength of 32 MPa could be obtained at a temperature of 65°C and curing period of 4 days. This investigation also found that an A/FA ratio of 0.45 has the optimum amount of alkaline liquid and it resulted in the highest level of compressive strength.

Show MeSH